Clip 2/8: Standard 8: Look for & Express Regularity in Repeated Reasoning Using Multiplication & Division Part 1A

Mathematically proficient students notice if calculations are repeated, and look both for general methods and for shortcuts.

In this clip, Buljan works with her 3rd-grade students on a number talk, using a mental math approach to multiplying a two-digit number and a one-digit number. She encourages her students to identify regularity among the various approaches identified, and guides them toward identifying the commutative property.

See this video in the context of an entire lesson.